does not depend on the choices of \( \psi \)  and \( \mu \)  and is called the fibered rotation number of \( (\alpha ,A) \) , see [1]}. Given \( \phi \in d \) , let \( R_{\phi }:=\begin{pmatrix}\cos 2\pi \phi &\sin 2\pi \phi \\\cos 2\pi \phi &\cos 2\pi \phi \end{pmatrix} \) . It is immediate from the definition that
\(|\rho (\alpha ,A)-\phi |<\Vert A-R_\phi \Vert _{0},\) 
